Animation - Falling object one after the other
A particle system drops cubes onto a collision barrier.  Please excuse the poor quality gif.  The file size is too small.

Settings below.



In the image above are the particle system settings.  The settings occupy two panes.  The emitter is moving at constant speed. Linear curve.  No acceleration.  Click to see details.

The floor is a black plane.  Black is beautiful.  The plane is a Physics Collision Object and its settings are on the far right.  Note the settings are pinned so that we can view properties of multiple objects.

Note the particle count &lt;&lt;&lt; than the number of frames.

This is not a tutorial on creating particle systems.  You may search here at BSE or the famous website that rhymes with noonoob.